Simon's first appearance has him fainting from the heat. Apparently shorter than Ralph, Simon is described by Golding: .
--He was a small, skinny boy, his chin pointed, and his eyes so bright they had deceived Ralph into thinking him delightfully gay and wicked. The coarse mop of black hair was long and swung down, almost concealing a low, broad forehead. --.
Simon is an introverted boy who cannot find it bearable to speak in front of the assembly. The boys all think that he's "batty"; he likes to be by himself and sometimes does and says strange things. Simon is alienated from the rest of the group. He takes life much more seriously than the others, being plagued with a certain moral consciousness which the other boys don't understand. Simon has a heightened perception, even more so than Piggy. Simon is unique because he can actually hear the voice of the beast. He realizes that the beast is not something one can kill because it's inside the boys. The evil inside us all.
If Ralph stands at one end of a line, representing civilization, and Jack stands at the other end of the line, representing savagery, where does Simon stand? The answer is that, unlike all the other boys, Simon is not on the line at all; he stands on a different plane from every other character in the novel.Simon seems to represent a kind of innate, spiritual human goodness that is deeply connected with nature and, in its own way, as primal as Jack's evilness and desire to kill. Alone of all the children on the island, Simon acts morally not out of some guilt or shame but because he believes in its essential value.
Most importantly, Simon makes the connection between the dead parachutist and the Lord of the Flies. He understands that with the death of the man in the parachute which symbolizes the death of reason, the chaos of the Lord of the Flies is free to reign supreme.
Lastly, Simon is seen as a Christ figure. He gives up his own life in an attempt to tell the rest of the boys about the beast.